The 1989–90 County Antrim Shield was the 101st edition of the County Antrim Shield, a cup competition in Northern Irish football.[1]
Glentoran won the tournament for the 20th time, defeating Linfield 6–5 on penalties after the final had finished 0-0.[2] For the 4th year running the County Antrim FA invited three clubs from County Armagh to compete (Glenavon, Newry Town and Portadown).[3]